const data = {
  name: '张三',
  age: 14
}
// 配置对象
// Object.defineProperty(data, 'name', {
//   configurable: false,
//   enumerable: false,
//   writable: false
// })
console.log(Object.getOwnPropertyDescriptor(data, 'name'))
data.name = '赵四'
for(key in data) {
  console.log(key)
}
delete data.name
console.log(data)